https://www.davidlang.tech/tags/sql/ Recent content in Sql on David Lang Hugo en Thu, 16 Nov 2023 00:00:00 +0000 https://www.davidlang.tech/posts/using-sql-dynamic-queries-in-redshift-database/ Thu, 16 Nov 2023 00:00:00 +0000 https://www.davidlang.tech/posts/using-sql-dynamic-queries-in-redshift-database/ <p>While working with a client, we had a requirement to perform bulk insert/update using <strong><a href="https://docs.retool.com/docs/working-with-tables">Retool table</a></strong> and <strong><a href="https://aws.amazon.com/redshift/">Redshift database</a></strong>. For this situation, We had to loop through the table records and execute a dynamic SQL query in Redshift.</p> <p><strong>Redshift database</strong> supports execution of <strong>dynamic SQL</strong> with the help of <strong>Prepared Statements</strong> or <strong>Stored Procedures</strong>.</p> <h2 id="prepared-statements">Prepared Statements</h2> <p>We use prepared statements when we want to execute dynamic SQL queries directly without a stored procedure. When a prepared statement is executed, the SQL statement is parsed, rewritten, and planned. We then <strong>EXECUTE</strong> the prepared statement.</p>